Mouse pointer in Android-x86 inside Oracle Virtual Box

Most vm software don't expose the full range of physical hardware to your VM, as Eli says, and in the case of wireless networking you have a 'bridged' connection, which in effect emulates an ethernet connection between your host and guest. One workaround that i found is, rather than using the built in (mini pci-e) based wireless, is to use a usb based wireless device, which can be passed through to the VM.

Try to Just disable "Mouse integration" in Machine tab: http://code.google.com/p/android-x86/issues/detail?id=341

Or by right-clicking the mouse icon in the bottom right corner of your VM window and picking Disable Mouse Integration